Device for holding harrow-teeth.



- PATENVTED JAN; 31, 1905. F. s. STURGES & J. APPELLP DEVICE FOR HOLDING HARROW TEETH. APPLICATION FILED AUG.18,1903.

Win/5555; y $5 I A TTORNEXS Y No. 781,031.

UNITED STATES Patented January 31, 1905.

PATENT" OFFICE.

. DEVIOE FOR HOLDING HARROW-TEETH.

SPECIFICATION. forming part of Letters Patent No. 781,031, dated January 31, 1905.

Application filed August 13, 1903. Serial No. 169,342..

T0 aZZ- whom it may concern:

Be it known that we,FRANK S. STURGES and J ACOB APPELL, citizens of the United States,

' residing at Milwaukee, county of Milwaukee,

and State of Wisconsin,haveinvented new and useful Improvements in Devices-for Holding Harrow-Teeth, of which the following is a specification.

Our invention relates to improvements in devices for holding harrow-teeth. I

The excessive strain to which the teeth of harrows are subjected, together with the vibrations produced in the teeth by striking stones or other obstructions, renders it exceedingly diificult to secure the teeth to the supporting frame-bar of the harrow, this difficulty being increased-by the necessity of frequently removing the teeth for repairs or substitution, whereby the connections must be of a character to readily permit of such reinovals.

The object of our invention is to provide an inexpensive form of device for securing the teeth in position which will hold them rigidly while in use, but which will permit them to be quickly removed when it is desired to do so.

In the following description reference is had to the accompanying drawings, in which Figure 1 is a view. showing a tooth-supporting bar of a harrow in cross-section and a tooth secured thereto by our improved attachment. Fig. 2 is a top view of the same. Fig.

3 is a top View showing a modified, form ofkey.

Like parts are identified by the same reference characters throughout the several views.

1 is the tooth-supporting bar of a harrow, the same consisting of a U-shaped' metallic beam, known commercially as aU-bar.

.2 is a stirrup-shaped yoke stamped from sheet metal and formed to lit the bar '1 when adjusted thereto from the rear, as best shown in Fig. 1. The upper and lower arms of the yoke project in front of the edges of the bar 1 and are enlarged, as shown at A, in Figs. 2 and 3. The enlarged portions A are provided with apertures 3 for the reception of the tooth 4. The apertures are so formed that the teeth fit snugly therein, with the edges of the apertures engaging all sides of the teeth, thelatter being square in cross-section. It will be observed that the apertures 3 are so formed that .thetooth 4 is held with its sides in planes extending at an angle of forty-five degrees to the front edges of the frame-bar 1, and at the inner corn er of each aperture a notch 5 is provided, which extends backwardly in the yoke 2 past the front edge of the frame-bar 1. A wedge-shaped key 6, inserted in these apertures, bears against the inner corner of the tooth/L and the front edges of the bar 1 and when driven into place binds the tooth securely in position. The key prevents the tooth from slipping longitudinally, and the sides of the apertures 8 in the upper and lower arms of the yoke prevent the teeth from vibrating, and thus dislodge the key. The key may be rectangular in cross-section, as shown in Fig. 2, or may be provided with a V-shaped channel 7 in the side which engages with the tooth 4:, as shown in Fig. 3.

With the above-described construction a comparatively small key may be used, with a corresponding increase in available pressure for binding the tooth& in position. The bar 1 being metallic, there is no tendency of the small key to become embedded and the key need be tapered but slightly. Hence there is little tendency for it to move upwardly and release the tooth. We attach great importance, however, to the fact that the tooth is almost entirely supported by the engagement of the arms of the yoke 2 on all four sides of the tooth, whereby its vibration is prevented.

Owing to the fact that the yoke is U-shaped and adjustable to the bar from the rear, it is obvious that the yoke can be removed whenever the key and tooth are removed. It is therefore possible to remove and replace the yokes and teeth at pleasure and to adjust any number of teeth tothe bar 1, the latter being adapted to receive the yokes and teeth at any point.

We are aware that it has heretofore been attempted to secure the teeth of harrows by means of wedges; but so far as we are aware all such attempts heretofore made have failed in practice, owing to the fact that the wedge was directly subjected to the vibratory strain upon the tooth, which vibratory strain was found to cause the wedge to slip and release the tooth.

Having thus described our invention, what We claim as new,and desire to secure by Letters Patent, is

The combination with a metallic frame-bar, of a yoke formed to fit the frame-bar with free ends extending past the upper and lower edges of the bar and provided with rectangular apertures the sides of which extend angularly to the bar; said yoke ends being also provided with notches extending from one corner of each aperture past the edges of the bar, and of less width than the diameter of the tooth; a tooth, rectangular in cross-seetion, snugly fitting the four sides of said apertures; and a key fitting said notches and interposed between the tooth and bar.

In testimony whereof we afiix our signatures in the presence of two witnesses.

FRANK S. STURGES. JACOB APPELL.

Witnesses:

J AS. B. ERWIN, H. Z. TAUGHER. 

